Roll over image to zoom
SKU: 93207141
Grundfos NB 125-250/249 Cast Iron 18.5 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Building water transfer skids and central chilled fluid lines operate with the Grundfos NB 125-250/249 centrifugal pump. Fitted with a 18.5 kW motor, system piping interfaces through an axial DN 150 suction port and a radial DN 125 discharge flange.
Pumping volume rating achieves approx. 6066 L/Min volumetric delivery against a approx. 20.7 m maximum head limit. Housing construction features cataphoretically coated EN-GJL-250 cast iron, accommodating a stainless steel impeller and a BQQE mechanical seal. Net weight measures 284 kg.
Three-phase power delivery at 415 V operates the motor assembly at a current draw of 34.9 Amps for 18.5 kW. Fluid temperature capabilities range from -25°C to 120°C under working pressure limits up to 16 bar. Flange interfaces are dimensioned at DN 150 inlet and DN 125 outlet.
Physical motor enclosure satisfies IP55 sealing criteria alongside Class F electrical insulation. External motor overload protection must be provided by the installer. The back-pull-out construction allows extraction of the motor and rotating components without disturbing suction or discharge pipe connections.
Features
- Precision balanced rotor and runner assemblies minimize operating vibration across all pump speeds.
- Cast iron volute casing with integral mounting feet absorbs hydraulic forces and pipework stresses.
- Replaceable wear rings retain correct internal hydraulic clearances over long operating periods.
- Solid stub shaft configuration supported by deep groove ball bearings absorbs axial thrust loads.
- Standardized EN1092-2 PN16 flange dimensions match standard commercial and district pipe manifolds.
- High-efficiency IEC electric drive motor rated for S1 continuous operation in ambient conditions up to 40°C.
- Back-pull-out construction allows drive and impeller removal without disconnecting suction or discharge lines.
SPECIFICATIONS
| Max Flow | 6066 L/Min |
| Max Head | 20.7 m |
| Power | 18.5 kW / 415v |
| Rated Current | 34.9 Amps |
| Suitable For | Cooling Tower Hydronic Systems |
| Body Material | Cast Iron |
| Liquid Temperature | -25°C to 120°C |
| Inlet Size | 150 mm |
| Outlet Size | 125 mm |
| Warranty | 24 Months |
Warranty & Returns
All products supplied by Foundation Pumps are covered by a minimum 12-month warranty unless otherwise stated. Some brands may offer longer manufacturer warranties. Warranty covers manufacturing defects, faulty materials and workmanship under normal use.
- Products must be installed correctly and in accordance with the manufacturer’s instructions.
- Warranty does not cover incorrect installation, misuse, dry running, normal wear and tear, unauthorised repairs or damage caused by external factors.
- Proof of purchase, photos, videos and installation details may be requested when assessing a warranty claim.
- The customer is responsible for returning the product to Foundation Pumps or the nominated service centre unless otherwise agreed.
- Removal, reinstallation, labour and associated site costs are generally the customer’s responsibility unless required under Australian Consumer Law.
- Change-of-mind returns may be accepted within 30 days provided the product is unused, uninstalled and returned in its original packaging.
- Customers are responsible for return freight costs for change-of-mind returns.
- Restocking fees may apply to special-order, bulky or non-stocked products.
- Used, installed or specially ordered products may not be eligible for change-of-mind returns.
- If a product arrives damaged or faulty, please contact Foundation Pumps as soon as possible so we can assist with the appropriate repair, replacement or refund.
Your rights under Australian Consumer Law are not affected.
How much water delivery and vertical lift can this pump develop?
Liquid throughput to 4243 L/Min in liquid flow and approx. 20.7 m in dynamic head, the Grundfos NB 125-250/249 accommodates diverse operating conditions.
What media temperature range and working pressure boundaries are supported?
The NB 125-250/249 safely accommodates pumped fluid temperatures from -25°C to 120°C under working pressure limits up to 16 bar.
How much electrical current and drive power are drawn by this motor?
Operating on a 415 V three-phase supply, the NB-125-250-249 utilizes a 18.5 kW motor drawing 34.9 Amps with IP55 weatherproof protection.
Which inlet suction and outlet discharge port dimensions connect to mechanical plant pipework?
Pipeline interfaces on the NB 125 250 249 feature an axial 150 mm suction port and a radial 125 mm discharge flange conforming to PN16 ratings.
Does routine impeller maintenance require disconnecting suction or discharge lines?
The back-pull-out construction on the NB/125/250/249 allows complete motor and runner removal without disconnecting piping headers, streamlining maintenance.
Need help choosing the right pump?
Our team of pump experts are here to help you find the perfect solution for your application.
- Free expert advice
- Pump sizing & system recommendations
- Fast response — call or email us